#include<stdio.h>
int main()
{
	int a,b,c,d,t;
	scanf("%d %d %d",&a,&b,&c);
if(a<b){ t=a;a=b;b=t;}
if(a<c){ t=a;a=c;c=t;}
if(b<c){ t=b;b=c;c=t;}
	switch (1)
{
case 1:
  if(a>=b+c){
  printf("Not triangle");
  break;}
case 2:
  if(a*a>b*b+c*c)printf("Obtuse triangle");
else if(a*a==b*b+c*c)printf("Right triangle");
else if(a*a<b*b+c*c) printf("Acute triangle");
case 3:
  if(b==c)
  {printf("\n");
  printf("Isosceles triangle");}
case 4:
if(a==b&&b==c){
printf("\n");
printf("Equilteral triangle");}
	

}
	return 0;
}